Use the new java_cpp_enum rule in content.

content/public/android/BUILD.gn

Index: content/public/android/BUILD.gn
diff --git a/content/public/android/BUILD.gn b/content/public/android/BUILD.gn
index 81615c3dc187d93016084bc6b53ae37db4bda43f..815341fd3f2d99da14b40ad8ac4b5a31e24ea441 100644
--- a/content/public/android/BUILD.gn
+++ b/content/public/android/BUILD.gn
@@ -42,14 +42,7 @@ android_library("content_java") {
 
   srcjar_deps = [
     ":common_aidl",
-    ":content_gamepad_mapping_java",
-    ":gesture_event_type_java",
-    ":popup_item_type_java",
-    ":result_codes_java",
-    ":selection_event_type_java",
-    ":speech_recognition_error_java",
-    ":top_controls_state_java",
-    ":screen_orientation_values_java",
+    ":content_public_android_java_enums_srcjar",
   ]
 
   DEPRECATED_java_in_dir = "java/src"
@@ -110,85 +103,27 @@ java_strings_grd("content_strings_grd") {
   ]
 }
 
-java_cpp_template("gesture_event_type_java") {
+java_cpp_enum("content_public_android_java_enums_srcjar") {
   sources = [
-    "java/src/org/chromium/content/browser/GestureEventType.template",
+    "//content/browser/android/content_view_core_impl.cc",
+    "//content/browser/android/gesture_event_type.h",
+    "//content/browser/renderer_host/input/selection_event_type.h",
+    "//content/browser/gamepad/gamepad_standard_mappings.h",
+    "//content/public/common/result_codes.h",
+    "//content/public/common/screen_orientation_values.h",
+    "//content/public/common/speech_recognition_error.h",
+    "//content/public/common/top_controls_state.h",
   ]
-  package_name = "org/chromium/content/browser"
-  inputs = [
-    "//content/browser/android/gesture_event_type_list.h"
-  ]
-}
-
-java_cpp_template("popup_item_type_java") {
-  sources = [
-    "java/src/org/chromium/content/browser/input/PopupItemType.template",
-  ]
-  package_name = "org/chromium/content/browser/input"
-  inputs = [
-    "//content/browser/android/popup_item_type_list.h"
-  ]
-}
-
-java_cpp_template("result_codes_java") {
-  sources = [
-    "java/src/org/chromium/content/common/ResultCodes.template",
-  ]
-  package_name = "org/chromium/content/common"
-  inputs = [
-    "//content/public/common/result_codes_list.h"
-  ]
-}
-
-java_cpp_template("selection_event_type_java") {
-  sources = [
-    "java/src/org/chromium/content/browser/input/SelectionEventType.template",
-  ]
-  package_name = "org/chromium/content/browser/input"
-  inputs = [
-    "//content/browser/renderer_host/input/selection_event_type_list.h"
-  ]
-}
-
-java_cpp_template("speech_recognition_error_java") {
-  sources = [
-    "java/src/org/chromium/content/browser/SpeechRecognitionError.template",
-  ]
-  package_name = "org/chromium/content/browser"
-  inputs = [
-    "//content/public/common/speech_recognition_error_list.h"
-  ]
-}
-
-java_cpp_template("top_controls_state_java") {
-  sources = [
-    "java/src/org/chromium/content/common/TopControlsState.template",
-  ]
-  package_name = "org/chromium/content/common"
-  inputs = [
-    "//content/public/common/top_controls_state_list.h"
-  ]
-}
-
-java_cpp_template("screen_orientation_values_java") {
-  sources = [
-    "java/src/org/chromium/content_public/common/ScreenOrientationValues.template",
-  ]
-  package_name = "org/chromium/content_public/common"
-  inputs = [
-    "//content/public/common/screen_orientation_values_list.h"
-  ]
-}
-
-java_cpp_template("content_gamepad_mapping_java") {
-  sources = [
-    "java/src/org/chromium/content/browser/input/CanonicalAxisIndex.template",
-    "java/src/org/chromium/content/browser/input/CanonicalButtonIndex.template",
-  ]
-  package_name = "org/chromium/content/common"
-  inputs = [
-    "//content/browser/gamepad/canonical_axis_index_list.h",
-    "//content/browser/gamepad/canonical_button_index_list.h",
+  outputs = [
+    "org/chromium/content/browser/GestureEventType.java",
+    "org/chromium/content/browser/input/CanonicalAxisIndex.java",
+    "org/chromium/content/browser/input/CanonicalButtonIndex.java",
+    "org/chromium/content/browser/input/PopupItemType.java",
+    "org/chromium/content/browser/input/SelectionEventType.java",
+    "org/chromium/content/common/ResultCode.java",
+    "org/chromium/content/common/TopControlsState.java",
+    "org/chromium/content_public/common/ScreenOrientationValues.java",
+    "org/chromium/content_public/common/SpeechRecognitionErrorCode.java",
   ]
 }